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TheAmphibianGuy
7th December 2015, 22:33
Is this chart on Wikipedia correct?
https://upload.wikimedia.org/wikipedia/commons/thumb/4/43/Ambystoma_phylogeny.jpg/800px-Ambystoma_phylogeny.jpg

JM29
8th December 2015, 13:47
It seems correct. The main subgenera (Ambystoma, Heterotriton, Linguaelapsus and Xiphonura) within Ambystoma are respected.
You can find a more complete tree in
Ambystomatidae (http://tolweb.org/Ambystomatidae/15448)

FrogEyes
8th December 2015, 20:18
No. It's outdated and there have been significant changes. The subgenera need to be re-evaluated, as more than one contains unrelated species. The Ambystoma macrodactylum complex, A.maculatum, and A.gracile seem to have no close relatives and should not be included in any subgenus with other species. I don't have time at the moment to dig up the 3 or so most current papers on caudate phylogeny, as I'm at work.

TheAmphibianGuy
8th December 2015, 22:08
So Dicamptodon and Rhyacotriton salamanders are some what kind of related to Ambystoma? also on that chart those cross things next to the scientific names mean their extinct?

Also is rhyacosiredon another name for ambystoma because in this chart Ambystomatidae (http://tolweb.org/Ambystomatidae/15448)
Ambystoma Leorae is listed as Rhyacosiredon Leorae

JM29
9th December 2015, 09:32
Dicamptodon is related to Ambystoma.
In the Tolweb chart, the old name Rhyacosiredon is sometimes used instead of Ambystoma. Nothing to do with Rhyacotriton.

For more recent updatings, let's wait for FroEyes'data. Taxonomy and phylogeny are changing so fast nowadays.

FrogEyes
10th December 2015, 02:53
Rhyacotriton is more closely related to Plethodontidae and Amphiumidae.

Dicamptodon is closer to Ambystoma. Those who look only at living species tend to combine them in a single family. However, there are fossil species of Dicamptodon, and genera related to Dicamptodon, leading others to maintain separate but related families.

Rhyacosiredon, Siredon, and Bathysiredon are synonyms of Ambystoma, and more specifically Heterotriton. That is, they are neotenic members of the tiger salamander group, with Siredon and Bathysiredon being applied to lake-dwelling neotenes and Rhyacosiredon being applied to the stream-dwelling neotenes.

The most up to date source for Amphibian taxonomy, including synonym lists for every species and higher group, is Amphibian Species of the World [online edition]. It has errors, omissions, and items which are not universally agreed upon, but it is nonetheless the most current, correct, and useful source on the subject:
Amphibian Species of the World (http://research.amnh.org/vz/herpetology/amphibia/)

Under "Caudata" you will find a long discussion with all the significant references you need. Most or all can be found online at no charge. If you start with the most recent paper, generally it will list all the other recent useful papers in the references.

Edit - yes, the symbol that resembles a cross or "dagger" usually is used for an extinct taxon, but you should always check the source to be sure of what THEY intend the symbols to mean.